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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6e7633b67d447107ea77d620068525f74f51e5965451f1a260bf4bbecd8125' 
  AND token = 'pUxJ0u6JsAW2umewWAvtJ0lSmGHdpNPHKrIelGJz0xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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