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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3955390e8efc62e56ea3417fc638d081c69ae48e477e8d493d7f8f3cfa55855c' 
  AND token = 'R8FhJ0gTvXPXet3mt8uB1W2aM9iFRVdl58oz+avEEwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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