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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b3ece04577fe834b8a5ddc137c4c2260731fd098fa82d8329a5fdd76e9c427' 
  AND token = '1lfm1XFL6C5pBExftnqbfqxVuFay0AAN2UzwBdPenVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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