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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c38f7670d35f43a90053ae198b8546a7a60086bb96f34b7724da79ab88dede' 
  AND token = 'e4gchAUaxiTBKhBTOXYsHvC3VDOoyXc+evw6/mtx1pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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