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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d8bc97267c739c2f42707f89053e94e3edcd9b47c3a919bb68c12b18232dac' 
  AND token = 'l1rHx2PGnE1xzM1b9dz2N0/ZMMnFLGmT3+syuOhHHDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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