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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d24a98192baedd4da1349ba0ddb3a80bbe35d225b032c4da048dd8b2d8fd70' 
  AND token = 'XWQsiW5h2Z4s5KiRKU59ui6CF9BjAAfUQgVBnVZXHCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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