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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8ffc5092b4e538a87b2a47e3d0f5bc1fa1b65dd6908af73cbbd8d517d25abf' 
  AND token = 'KtFSQG0U4DysH0scbap0kjz8FkBcEFDr6kWzuJrWeTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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