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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa7035ad6c3efc716b109ba2c0f90838ff9630a867995138902d264672c85fb' 
  AND token = 'd3sDUMf0vg/lq8hJ22VsmDp2RRp4FprT8h4MBBxaFBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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