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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb23e756e60d767773f19e4c002b68c8fb56b171847bb739f04f11f693e13d9a' 
  AND token = 'aGeDc0aNInmhMIf01t2M0zSZB5umT9T23d1WEskFB8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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