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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2a26b668f90f3b397a40849939c714be9183e11865c5a8485a361709de9ec0' 
  AND token = 'KfNVI64sIEDfuZAl9hr5F7Un7yA8+1YG6qI+kPvMKto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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