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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c487b9ef0d1255f00ca3078b05239e1f1ef42df517b61c1cb8da886f8ef3eaf' 
  AND token = 'AKtPOFd9jZDFRIygHofjDG6GBZ30UHG1Cqs9uzCl2fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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