SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85828a0a3df1efb02eb6a2edc7706a6773f58bb2196f623c9c5c983a66931683' 
  AND token = 'OrfL+hgrXy4BZvs+oPnqJ2z7kth7NOGz7HYuDma5ta4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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