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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae027f52762a2c8e6c507b3ab83b2ed3bc903701665e3af3403106dd18c1ebd1' 
  AND token = 'ZY4rx0yLipsgCerjX8O98r9Ees8om3cwvhqDJQbuDCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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