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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76c2efcfc17a39a3720c050053ff78b91f8162d4b205a14ba51743984a16541' 
  AND token = '2/rYlnIi90t/0qQ/rzZBh+CFC49h97iFqcTD42eSJrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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