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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc23a7fd05d545401035ae72950bb7df0df7824dfea81ca218a9ec5d1c34199' 
  AND token = '1CEmJHkbbrIZsy0Xi3WiRaNK8DNTkfD0i9UnLzl/Prg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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