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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b026bcaaa2ad7d2c1276e1503e7f93030726f027b331f4cc5fbd5e041ce92745' 
  AND token = 'ebvjz7QNoNK054ASPNA/+UWh2sOHQEsZNcv+z46BY+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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