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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5538ea7fef51fff2a7e14b8a3de1642ad1184ce9a24d99919ea5dfe531f55c7' 
  AND token = 'vMHRBLQRGnU6AyleDh4ns7gvGcDggoZVJHKqMF1cM5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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