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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd9f986fbf89a1fcd4d671d228560e8c3b25659619fa3299dd38bf937c9a45c' 
  AND token = 'COmuim1AT+qoij5R8/6aniPr7e1wzNlG+FqNVHOdbOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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