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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5f23d5ce916feb138b239f0f676f750cdee0c63faef6abd3522d41b7d6fad6' 
  AND token = 'ixF3BH8r+WatvpxrXAflKeWEVqB8Z4gJsYgdYOyC0t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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