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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f03800f16692a5e042412ab392b1dce1aa3580af920a8f26cc37035dbd2279' 
  AND token = 'VSxgdC2VDOnRPQQrXsX/0InLuz4eZhpb9zdqrcOx1IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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