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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f79f15d9d56d03ca7cd138ee3665c5ab2043456dcc76e3bfc50c557eb2ffb3d' 
  AND token = 'fWaxUz/6pHznLkBCQsY4h4IpbDJIf93EpIVfjmuXYKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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