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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2c8cf35c430694851fddd82d54fdb0b495bdf347bd95feecf74609ce2bee7b' 
  AND token = 'lVG/V+S0e/xWxJGfrkz2tzs3m3Wm7TF7Eb4h7B04yU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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