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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cc024205e06a047565429ab1c8c08e2fb29e342b01872a96624d50f8182360' 
  AND token = 'q7bdQuhq8mI2cH6yMn6I01Xd0lF/wP7c3JNxK1AerfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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