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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1da5a8ea0cb55e40ff6211a5edefc7072ecff2fd1592e8725ee806bbef75b7' 
  AND token = '3R5Uh7hWJa4IFr4XEQBbLEgSAENIUiuSM5YOpYWKSZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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