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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310a802826b1c748881961359db735bb3ec1e2be2abd27f9a72f4eef863afe1b' 
  AND token = 'wZviZntcVkSputnmi4y8aJtmQ9A0I6dmn/RB3tQgNXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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