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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1698225fcc0908fa01d0252d331e9d801926c44ba89b0675f940d59e340e9f' 
  AND token = 'OzmjM6FwI9wY9vpbu4O4NNk49ou4yWn/tvKiYzn+wW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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