SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b95dcd8516a34c1d9c8247719cc7d2492b74f69ba31b83f74c6d46424ecaf3' 
  AND token = 'cStj3BfltzgZMGtY8cYYK2wxfsYL5JTh3WO4olhownA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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