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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb00a94f006c56535701c5892e371556f463b5845bda7d9a0e4a5a78a7a4aed' 
  AND token = 'uLOF7lffpUUPuhExcl3cSTH9usR+UXaVMZ1HonLyBvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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