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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd494033d2fc186275d2499cfb44e2689559a68f0f84417f2206e8fb59a90b2' 
  AND token = 'bMcLC0HMSYZKkQYFXMdiUI4IdHBm0XIBrXalzjo2Vq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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