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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f13cc246ce4b36d32512aa9990624a3d3af7abf9168a714ef03a94fb4f4a74' 
  AND token = '63GzjwFmo4MiAhMogDYH+A3fdpM3ak+zYzq5Qg3YebU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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