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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121a447f91ec57fc3f752ae6ca96b80258d8b175e8aa99a24505d9d8ed8b9880' 
  AND token = 'Y88Pa5tMbloqescyAv7sslSbQX3Eii/HpwqPuRqi7bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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