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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3c709b8f0bfc70c5b0756ecf2b73436274a9dca0122ced2b6eee74d1922be1' 
  AND token = 'crD4NC8kkvr16ZNxAS9GsdUZAOnPgHj2VvPbyHt7Gs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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