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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28efa06ed2c4ab1c21b66f44a61a9396c729ea60a86830bee1d6428cac509d3' 
  AND token = 'bG1szKvDxJt2Rvu7kj8S7B7U+LP7mo14xfBYpD32N9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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