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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25ec8e017686afc792f75818de09c5bb211a743a4b366049dc96f329ee2b7ce' 
  AND token = 'S7EzIu3aJCUbBt322iJFcoYiumC/94z8eN0gJmSMcIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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