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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165292e423c6f1ce1278fa10a8819fe254d4bfbf456fa6eb614c6ffac5ac7465' 
  AND token = 'v3+19S/05oEB5AVfIblnCteZ/ULFAAKAVoCKZEYxtWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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