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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73377ac5db036064258e75129b59aa44472d5a69926eb52c5d18776db15779b5' 
  AND token = 'rlZOclg945luTRWGkWX4N18vksaJxJaPWHUjNZMUU0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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