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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647d63b61af0a6dff52c47691c15ad821aebb8e3cbb43a6670944efb91e20477' 
  AND token = '81k0sVmeSA9WC1XIdRgE5eghxnQYxQF+E3p6SZ+tRWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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