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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a799d91d3bfc15b1015501d7dcdeb852db9e08415f9a7dd569c6c7fed745a41' 
  AND token = 'BbCU0FNSangH0XuLWXP1bzPw+HM2Bj9uheg7h3lBZFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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