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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd773762b85ddf76677a04c76b7330f4dadb96455f97a4b2f5a717cd815ff3a' 
  AND token = 'Q9xDlR7wndH/EBLd7AnB4ZGKnS+u7LHjedQL0oaFgOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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