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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fc64336b13300208b7f69f6d64d5123c07c1566183372be9bf5e74267c9f05' 
  AND token = 'W76PbNXidY9IP1yQ34xqpLP7mXE5IAB/JTKVpYVIJ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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