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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace811eeabbea6e02d12d5ca9e8463430845d0809582a050259c3525576a56a5' 
  AND token = '03pU2NFn7IkGe54QawJh9bXUJvEsIVfWXIuKlmxeBAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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