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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88817daeabd5f74b1c05dd196f7ca0a54dbb27dd53753c84af945e310c527cc' 
  AND token = 'Xp6eWxr0J7V7wD3CiMb/dl2NO3zwIjjEGaowoAyXdtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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