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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c5e18d5732b7714160453be0557984ab4f03e570f23ade7c41f687a7ad7f70' 
  AND token = '/UbYeL10qixFPkOFCJ/FO9IFgBCQ6DCuk31oXrAq91I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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