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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bb470a91d3e9ee38aefdbb78792b4ee932a726073084cf397ae489e56a29af' 
  AND token = 'zSSBZdha/DwAJeg8B97oZa25UeX2EX5hBxloshalDjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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