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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a087e2b8affb59c90045c31d24114891dcc2dbc20b468f7c1fdd3a70dc79f4fe' 
  AND token = 'i46g6Li3ZwZ9NvmzAAwV/iMz05eebnD7EUOQlQItBXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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