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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b32a76f712cbed331591367276345dd973671d4a31944ae7439b12b2b6f531d' 
  AND token = 'Uq9ZDl/WvNBAvoRYRAyCSaObfcX55QsG/ZFZkfMPJXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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