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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55f87495ae2f4d952c86727e6d704caea6543f306f49d0028e50f27e7014579' 
  AND token = 'yhpS8lpbgFA2Iy0LqkC6oudf50l+7em0X2jCj4Nhpxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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