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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411bbc9b5cbb9d46e3f0715cd75d2dc109fd4deabe1bbe1dcb438c9b47994bb3' 
  AND token = 'ZLB9UFD2s7fDJUfAqX9umihg6SOV+7L6X9QR6/XIezw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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