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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d39fb4e04fff43d867ececfc3b173a4b46bd11fa1bf4d130af043a7bc7e0e3' 
  AND token = 'Yichoe2mDxWUe+H6pMD+Idg4dQW99xpi628avOjEslo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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