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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2804a25b5fd0d27420b5aeae6e8e92a4f92cbe4d52f3fcc822c5c2bb912dc7' 
  AND token = 'rG0BNN41/FKUFr0sJdGx7XC0BENp8o8QbmsN2MqDeA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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