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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29fa38cae0364cc91fd3d97f9f17a00a270d396304a71cc9a220171c7aad5c5' 
  AND token = 'aCoD6rxjJ2ZqkXSeWHvr5kxL+7xxU7TSw9MtOw2Yw9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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