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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0db2578bc573de3e5f5f8159ac829134a02df5200a114fb908fbdd43d37a8e' 
  AND token = 'tUi5uTGcejjMp/Liw/4jz+a/HpimiGedwJWwzpgOl4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}