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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b93632832082563d1e11ae72f3f9ebf6a360f8e114d40554fc4a26dd1fde2e' 
  AND token = '5TuiOewtpMxvEdK/lEgVk99g3SnxcZt25GNnGKAwspw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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