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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512264a7f62ea3a3cf65c845736c8aaeedae99206e9ea5e4ecdb83cf7e51cd61' 
  AND token = 'QCHQG1q8d8suFlcuWBTejjK11RF9Jbdz4DECz7qTRo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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