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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96eb371e4cc67450274fbf105578e418b6cd4aaf33d8e36695c9c0190c93e80b' 
  AND token = '7bzR7Eegmyb5oqqJ6PYPg5V/dnAmSkdOdmcJURxanBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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