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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4a5e5e03f5949e00c688abd4037c95418b534e232be80a1007b6393f079fb4' 
  AND token = 'qfdc3y+/eemAB1FyVsCyfPhiQo06/O631v6PqAXtmOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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