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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766ae1ac3db8e4fc68381d02bff970a08952f29d310f254ba70326b80a7710c4' 
  AND token = 'moor3C3xDagBsRbkMJ5sQCDb6DoGKKOY3ISxswGizGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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