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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f68060c4b9ee54d6590e249a5811a6b7df4ef52140bd4c4b4d5622ce183933' 
  AND token = 'AwTzU5EITXbUb5jlCmzKUFkdnnuv2etG9g6jYQ3vFj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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