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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1cd534aeb8d4634021cf1eab7e8092789ee708ca1687a1569f8e3782e9a28b' 
  AND token = 'cbB3IYZnRj25eF/FExS9XLi9hw2VDR4oLEehqHhpcSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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