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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be4cc38e158748f9a41b5945b81dfbc28eec807eca43f77827087c5bd83f65d' 
  AND token = 'ECxuM3d4ZtNybxEDGwlOhAJ7CDzreLLpnOkQzB3dboo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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