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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d33f1663635a88c1f1486e9c5d5b4ed1f8423c3b9a3eb0d99dda7bd6ea7c2a' 
  AND token = 'e6uITKa54FW2C+i+dckEOOC7jUxUqjdn6hcUkqSNmHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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