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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404e9d16c0044d9b7ffcf0ab148beeeea698e7593fd8e3f89732b338674fe1c9' 
  AND token = 'agSl69rFlkMpn8Bxd/y5QXxjnZflV2YSB8ZoUFDXsc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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