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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a1055e22c0bc39c22c507848de8039e18c96666ffc10b6344671b5aed684f7' 
  AND token = 'NjV6Kvfp94na2uwcTl7y70iN11fP0KEHdU+l4FlyitE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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