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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98315d9b1f0af791d7b1b30dbc73e1cf075a21040b20de5038987c01fc8c07e8' 
  AND token = 'CUXQSTK3c7HK8eeEhtAVRJ8+tij08NzDa8f/3UtVQlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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