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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1284b3341fae791e59f56683d50c4392b15f88370d5935ca79c18b7173935aa7' 
  AND token = '41P4CZM+TqTGgNdSvoX+8GtkZ2Po6B4j5Rl4zbg4Yfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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