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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbce32ac2a99928293c4a5a943d28ab3c5a1da15e8c443772d3d7dee1119e204' 
  AND token = 'S3QQgLE4Mcgx4T8WzC/qvvznTJW8ZVwpedHQ/1h/M2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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