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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f83afcccb20f50de923f58f3a6da9ff5eb6dad84ae9c2d783f5cbb321991a5d' 
  AND token = '5B8vamXEAlx8zB+Sfcj1dOfFmePchF7JKMdZ3up1ehg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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