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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c5f7d430918c8b233ca29771569eb22d99fb933c450c26671dff8a1526089f' 
  AND token = 'kyy0qKNmTXTIegQTI++4ePVcGLQyQJr/AXDdKtQlsrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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